Table 3: Effect of treatment with ozone at different doses on root and stem rot disease caused by P. sojae on susceptible Sloan soybean.

Ozonation time (min)	Ozone dose	Rate of ozonation	% Emergence	% Disease incidence
	g.kg^-1O3	g.kg^-1.min^-1
0	0	0	48.0 (4.9)^a	73.5 (4.3)^b
10	0.47	0.047	81.2 (8.6)^c	0 (3.7)^d
13	0.73^e	0.056	81.5 (6.7)^c	0 (2.3)^d
15	0.79^e	0.053	71.9 (7.0)^c	0 (1.9)^d
17	1.10^e	0.065	65.9 (7.1)^c	0 (1.7)^d
20	1.2	0.06	61.5 (8.4)^c	0 (2.3)^d
25	1.41	0.056	56.2 (8.5)^c	0 (2.3)^d

^aRates and percentages are the averages of samples readings. Less than 50% of seeds emerged in control pots. The non-emerged seedlings in control pots included 80% rotted seeds and 20% non-germinated seeds with other symptoms; ^bControl samples showed a disease incidence on 73.5% of seeds and seedlings, including root and stem rot, damping-off and collapse of hypocotyls, and stem lesions; ^cTreated pots showed a decline in seedling emergence as ozonation time and dose increased; ^dAll treated pots showed healthy seedlings, exempt of any symptoms related to infection with P. sojae; ^eDifference in dosage increase in response to the same increase in ozonation duration (2 min) is due to the difference in ozone absorption by the soil samples. This fluctuation depended on how tightly submerged the ozone diffuser was in the soil sample. Doses presented are averages of dosage measurements of the same ozonation duration.